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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e82fe8fd6afb5311f793fc243f8dc3c4300bc0d4b71d844e0fb885d79333ad9' 
  AND token = 'ygwc8DS7iTYsoOKgaEN3gcHVQyC9AguYqrqrT6x9pRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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