SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a345265992301ab1fe3ef382eb722fe78eb8ab41c8b80814ee11454f2c06133d' 
  AND token = '2chOWgBA8DzSC/vf7XDuzMjWiIqc1IaJrGSJkrwfc0A=' 
  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