SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a9106b6fe955baba719b18c763fb73c8191f0859899ec82503fceaf35c211f' 
  AND token = 'zTAYNb5DRVMtsjZh/RjUmPHk5e9r+ZWPaOfFF+9oAVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

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