SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9efcd5438e53cbdde27dc4d01ae9bbd8f85755f7e7d8f42d6e87c713d7823d7d' 
  AND token = 'xkyLo0h3JIc9DcBYx3qLYKuV+sGqFZTl3wUGR841OaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00111

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