SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4da88371f3ac95310f9c63070943384f961c806523fbf3de0b5e437f347b40b' 
  AND token = '19Q8VPOtnvjjV/zacR17nyYOs01XXaqsjfBmrgZPz2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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