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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95580ac683a421ae0ceb63c8f5bbf93a1017cf69f341a099ab48d303d16aa4d4' 
  AND token = '9r8LrxIZ942rWdION48fkiEbCCFcuPaFoUhGDLOzoME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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