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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed7a2e5cd9dcebba2fe3b8a20bfb08865c4d64a13c8c7d34af991ab6b8effb3' 
  AND token = '+7Y45PZ8MJ4itRjww6eWEr1at3AiCrTYUSWvUtNvm3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

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