SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c69637776fc9431eca64b2a8821571fb544cddf0633d5383bbb15b4e1fb84700' 
  AND token = 'sSZWeUnWeU5l/86uyq6I9okCSYMavsQz0eVq6V815+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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