SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bba99efe0d680c84ebd5a36a5957462bf4cbd42807a55d82782cc9c823fcc2c' 
  AND token = 'YC97yJNHwozBjE/7lOjF/FQHmEkDFXtCgKMNWLAc5ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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