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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '538a7ebf1179edfa7029951c8ebcc5d1be3889149aa182613d6cd447d2ae31db' 
  AND token = 'bXfabimMwGsaiOrVaBfI7EitAaRAXTfR3uRPhw5CvcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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