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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bcfa74b5e961f4c4ab52b9b155af8e69501a4ececb68423db649b97e8ef6804' 
  AND token = '6v/sBizUQfYzCsiouFuHZ2Or1XE5unL4k8yOoZ03lK4=' 
  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