SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f53014c173c458e6f866fe7bab53b511c23687e0a283b94b59d5d8242dafc388' 
  AND token = 'cRVL8hBIh/28+aY5Hvd1IHx/FMmuRAOKMvDzBBtXnuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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