SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6363ae70334690b5b7c7a2983d4103094f7f565c556b09edaa8d2cc9b30920d2' 
  AND token = 'jWEUcnPStQrbwb76b2zQrTfxfZ8w8WxCNmRElYeq8+o=' 
  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