SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdd9281824e6ef3ae3a4dedb8064893b39536041fd1656c076f74661a485c995' 
  AND token = '9Vq/4oY5Kud1h0QR2TNA7Z22TQGOkJG9lOfRFtgY/XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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