SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd6bb3964e12283a290b665848ab07d074748ae4967862bf57c6bc02560f898' 
  AND token = 'LC4KjzzT3tK6sZFKWUgKhidz5XFqoLNwt9HYUlR2oRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

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