SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4537c24bdd923b3395ec4282737f58d0c156ed193b6e855c75389304fc1f30e3' 
  AND token = '1U2q93xHwN6KDzysJebQXXDw+ZnVgS2qMcyhATPaTxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

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