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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67f472cdf74fa2bcd947247b44b822b4c3bf4f2bfda85be4c21e31dcdadb2707' 
  AND token = 'lWP4ZqL0axkmYrojBMQ5gYnYF4INsQ9WilLmxOqS1XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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