SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '460bc4037c67450c31ba2e36c15346751504af08234a4d436c8d1d246c9829a1' 
  AND token = 'MfAilqdpw/FLwyboKJmFIc2Qx6OBJ2QcpOZw4SmYuOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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