SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ec8d53c78b64433f63d245d9c87ca1fe53eff3485a268e933ee2996c7cb736' 
  AND token = '1bBgTHBMYJZqLg22xgNsn7zs32xq60gGRzVLkGCBCdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

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