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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b16e3e8699352c29097fc7f222a9118ae617281b4210da07f5601e2f8c67ebd4' 
  AND token = 'VKa08dHsYaC1mW9w5MUDjnmvkOASWvwZq29SNAyfzSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

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