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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f73d876da88a6aeef9186f4b9196704e867fec11539673395d5e1c7ffd5b086a' 
  AND token = 'F0WtR8FY39jqcymqHlF5sstO3gAP5J8xL7gJo99VmbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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