SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a1a9e84f010192e8a2e33f4640954245e87ab7782b68f166da8352ca591d429' 
  AND token = 'h+KPWWrjAfBmrX8FGyneaY4FfNnFNwyxp6iZpnlU6vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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