SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa2c2824c7c7b2c8c37db41ea64c2980f062718c54c62d73930f9155401377f' 
  AND token = 'Pz9RQxdS2ZN8mq/ejsJ6ajuYEVwv6igqEOj2M9bSz+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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