SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac85e0a897628957fccdbac0f63799345ee9a6bb476bab0093b12a67aebd37b' 
  AND token = '4Ae9VYdJ1Q3purOe9YSqo+ZvmQqUveKNH16hj2XKep0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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