SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09784b7711ca1e726184bd35c1a28ba10b0382bd8804c4b6e3b4181de5daf826' 
  AND token = 'cm6oyCSU+j1kov4dFhpKdpbr7tOfEsj1bMkF1JoodkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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