SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29c7222515a7a64b94f43171a672a343614758ca49721b3781ed3f6525da01f7' 
  AND token = 'Sh6nTRT5x9leNx/bpZSPaNFhCL5wVN337HfnrIBJjRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

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