SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36424a154fb63e7c79526696fe53c90f17a499f7cc6bbcf3662e1e16fb474c63' 
  AND token = '/A2jUyvn/b/sjhj8TX1R/5J3tRl0eDIDtChrtSHf7iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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