Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca4703bf2d2a1235953ccc57b007b72bc862df5318ceaf4107596ab51ddf99fe' 
  AND token = 'UhpEMIU84TpSDnIU9fqqi+3liFJxHRbjx1iLjYUexKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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