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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ed0a0d12bf9dcb249577726942eb67cde89f2ba5904e628de95ac7a11e7f22' 
  AND token = 'wcqtXuo7knwVAhE88nsngBcXVTM8mKfnFX8a8JsTt98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

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