Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ef074efe8d7b3f12a96d55c39c820b92a2dde38fac0a9cf0bec1bda8fa802a' 
  AND token = 'k16pySMnWZOB7gCtYlJE3J/4sYRK0AoLGV32tcF9W40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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