SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc62ecbaf2cedaaa357fb60452d73ea273d91d6aac26889cf3920fadc76c0eee' 
  AND token = 'wU0C7Fg77fUG+oYYYJkcg0nuoKvFnmCZJYkqVHcIvxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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