SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e4f3f89ca06b445d92485bdd90231f2246a411805f1d58f256882db36f4574' 
  AND token = 'yBRAMHOUN0Dxk67bBrHE2epfYuc2UAvidlxFo6lTJWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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