SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a85240836172ac2ae1722c7873d6e143843d5375ef3fd5bdb63ddf5412c46f4' 
  AND token = 'AKEbwpY/3d08c0MO46WPWcw7JTkRTSdg2XWiIZI81sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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