SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92dac024dc776815aedf6e32842e7954d83b5cee787c9980cf56034835910f5f' 
  AND token = 'cAjbLUu02EZtK6kfDZAbO/3BPDUu0F4RNGcv+ROFSCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

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