SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c33925123aa194bd3d0a178fee5dcdae42bf56816636980811f720fa679b347' 
  AND token = '7lOq6frrkMv7+nsYJsFD2t0bg5cC9/c6F7CjgMVVEeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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