$arOrderProps = [];
$dbRes = \Bitrix\Sale\PropertyValue::getList([
'select' => ['CODE', 'VALUE'],
'filter' => ['=ORDER_ID' => 6, 'CODE' => ['FIO', 'PHONE']]
]);
while($arRes = $dbRes->fetch()) {
$arOrderProps[$arRes['CODE']] = $arRes['VALUE'];
}
print_r($arOrderProps);