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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ef1c76896d62d85c39b6209a513159b7ccac04685feeb6e366517276d784d2d' 
  AND token = 'yxYxI/wcz35aUOdCfTZ9/oCJ+Ue+WzH8VYpe1WfVJjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

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