SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c39a8542bd596c82cbbc5fb14d8931ab832e11466948f96cbfd4b923699058' 
  AND token = 'sbGf3qJ8OGOF9ov+LPpqdsO1HqCuupaPQVe/ASYuXsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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