SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6770dea6877df03ec7a9ad8deabffd25d7e5a537205e6374f48398098d34d7f4' 
  AND token = 'dAcp5r9YJx4PlpXhEfBqhvDvBHWnGp5xF+QLxQzLmFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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