<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsd="http://www.w3.org/2001/XMLSchema" targetNamespace="http://okeygroup.lu/xbrl/20221231" xmlns:okey="http://okeygroup.lu/xbrl/20221231">
  <xsd:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <xsd:import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd" />
  <xsd:import namespace="https://www.esma.europa.eu/taxonomy/2022-03-24/esef_cor" schemaLocation="https://www.esma.europa.eu/taxonomy/2022-03-24/esef_cor.xsd" />
  <xsd:annotation>
    <xsd:appinfo>
      <link:linkbaseRef xlink:href="213800133YYU23T4L791-2022-12-31_pre.xml" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple" />
      <link:linkbaseRef xlink:href="213800133YYU23T4L791-2022-12-31_cal.xml" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple" />
      <link:linkbaseRef xlink:href="213800133YYU23T4L791-2022-12-31_def.xml" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple" />
      <link:linkbaseRef xlink:href="213800133YYU23T4L791-2022-12-31_lab-en.xml" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple" />
      <link:linkbaseRef xlink:href="https://www.esma.europa.eu/taxonomy/2022-03-24/esef_cor-lab-en.xml" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple" />
      <link:roleType id="CSOfIncome" roleURI="http://okeygroup.lu/role/CSOfIncome">
        <link:definition>CS of Income</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CSOfComprehensiveIncome" roleURI="http://okeygroup.lu/role/CSOfComprehensiveIncome">
        <link:definition>CS of Comprehensive Income</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CSOfFinancialPosition" roleURI="http://okeygroup.lu/role/CSOfFinancialPosition">
        <link:definition>CS of Financial Position</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CSOfCashFlows" roleURI="http://okeygroup.lu/role/CSOfCashFlows">
        <link:definition>CS of Cash Flows</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CSOfChangesInEquity" roleURI="http://okeygroup.lu/role/CSOfChangesInEquity">
        <link:definition>CS of Changes in Equity</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Notes" roleURI="http://okeygroup.lu/role/Notes">
        <link:definition>Notes</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Anchoring" roleURI="http://okeygroup.lu/role/Anchoring">
        <link:definition>Anchoring</link:definition>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xsd:appinfo>
  </xsd:annotation>
  <xsd:element id="okey_InterestAccruedOnLoansAndBorrowings" name="InterestAccruedOnLoansAndBorrowings" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:periodType="instant" xbrli:balance="credit" />
  <xsd:element id="okey_CashPaidToSuppliersAndEmployees" name="CashPaidToSuppliersAndEmployees" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:periodType="duration" xbrli:balance="credit" />
  <xsd:element id="okey_TaxesOtherThanOnIncome" name="TaxesOtherThanOnIncome" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:periodType="duration" xbrli:balance="credit" />
  <xsd:element id="okey_VATPaid" name="VATPaid" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:periodType="duration" xbrli:balance="credit" />
  <xsd:element id="okey_InterestPaidOnLoansAndBorrowings" name="InterestPaidOnLoansAndBorrowings" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:periodType="duration" xbrli:balance="credit" />
  <xsd:element id="okey_InterestPaidOnLeaseLiabilities" name="InterestPaidOnLeaseLiabilities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:periodType="duration" xbrli:balance="debit" />
</xsd:schema>