Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eebf9d80d0cdcd08725bde0df6db7f3fa67599afec22b66a116b793c553ab26' 
  AND token = '6LPhD09vNnblfBB7olSCvApVDdCAt60scVCLH9Xso6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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