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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e32f6f6e6ee812ec12280bd99033fa4f2f4ef647069a430ac2084254a66702' 
  AND token = 'hyrNWgpnQDXs7mWzFrJOTPs2c5uLhAWAvBEu7W5Jq9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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