Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6de7879c2c4517df5b570e6a152e328ee30822e9921e5b17fe3be2fe616def93' 
  AND token = 'TiVnhhxBCMMBwJiBFja495cs2CccAxh6BgH+WxE0TC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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