SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085f4ffb69cfa97f1e242b0f63ed1afa86fbf3f640868afe8678f77b30f0eee0' 
  AND token = 'ZSCgsWUvg6IpTcjPS134jR3DcoT/9wJ1+eUA4UWwurA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

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