SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c153962f9149bd39a4e68e9632f45ca98815752c0c82dda425ccf55d3099f474' 
  AND token = 'jJdH1OCarr7nQMZuUBdL9Nu/yPjXFrbhkQeAPnzDgZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables