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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18f4e3558479c4af199972c36a7d69554371dad20acaab86d3dc6a25e3c36d7b' 
  AND token = 'foWOXCDS4owdXDpkDLX1eGka3iUBtPfl+dwEIBus3Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}