SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b1fcd78e92cedbd6c8ad6eb2d0ad89f7e520f398bee2e59e46239878dfd1285' 
  AND token = 'GKDpPnlt/9YuN4XCHNeeHmVpGUcTQTnAAqwU4Vi1OUY=' 
  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