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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e89f1ff1612fdab707e139e24a6b5194bf8ca1a0e340aae61298844722a638a9' 
  AND token = 'LbUwd3g9KCkWZ+MKqMg3lSweWbUi2bQkfERaKdC70v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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