SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8f77e6960f68268ac6fce67c4c415ab470163d82a4e8b9895a180f713063996' 
  AND token = 'FMDHpANNL8B/8bjLcMLaGfqXKTHW1PCFn7jqavfDxAE=' 
  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