SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a88366d5866c703b49273bfb6ae9e2b357dd1365ff1134162d896efa441019da' 
  AND token = 'U3HWy0S7f7i4DWz4UP7XL+Sz9d2mDg9pYeiPGdP77fI=' 
  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