SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35d32fe2c2f4298262fd31a0f1f47e1da509aa3f781e435483eadaba1beeffa4' 
  AND token = '5hhA7t2se88aUXqda57xzYYXVl52O4HNeDXvoz55E/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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