SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e67c6ca13833891a89e6044f0d87c4af499d0e8f0886bea555ae748bbf96ceb' 
  AND token = 'Qqea4SAc/883KI8MrXYYOGM4rBq4W0Rk1cXhoTr0jFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

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