SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9724543e0dc731d8335f808c7913a30b112ed6549b201b6662213315263ca7e3' 
  AND token = '7CUKoj2GGZahQfqEWYNXzOYHd8YYzVib/RZb3mh1zYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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