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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c2053940ca88f3a5d1f4bd9e7e0d2d3d648f2796c0e8ec9fac35b98fc85639' 
  AND token = 'IWgpzjI8aoUEa6Z5Kz8a7CQl9g5NnpHlqFx0rYgb08g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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