SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '648c734fdf3b16c8787db4df1d622ed2ed4cb429db73cd2e5b1f6dd49c229f59' 
  AND token = 'Yjt/FgifqDXUhWLa7ccGqkRoIyFN+Aw7plMI2+RozJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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