Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfb595489fed43c79b81a89533412ff3f969965e99d736eed45538ef92acb9ea' 
  AND token = 'FS1tisM/74wTO68EMUfwCl+L5XOiWtylAvWVIv1IzEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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