SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26afcc753548b396ff3821c2ef25e40a94195dcc02c5ea2aa86bb2d55c8b04e8' 
  AND token = 'YzHuRqAkoNpummtF/fpRhYeUquRQj3CHJBriuQ9Kg40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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