SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '702a64897179c9a0f446ba5f17294dfe4cb08f790ac90d788667a88d91b8763f' 
  AND token = 'QuHKHtw8yEKaiwVKlZNu9LN41GEmyp/nlOEjdCENHRM=' 
  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