SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d3713ef72f38550d8620dab417b35b95f21b97a255719983869898dc59d0123' 
  AND token = 'Zwj2ltm8VKPN8SgNMRWoAb9mB/TDQecT4KgCTpsNRnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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