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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c927606d13f0e6be89d7ef1562a06d26d2b37d6f8d460a5742cb93246bf55939' 
  AND token = 'NoMdy8gpH0YfEmbKNmhWH88uM20h2WClBlPmQOHYSAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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