SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e336a3b33ccf8e544c12e5b7225f53c8a79cc1d030e64217e9854068edc0963d' 
  AND token = 'w8Rcd4sYoleekrHsKY1tMZmtG8T5izH1rMlfAF+HS8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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