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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34a4e8ba4717918a40fd066a40c88fa21d6ccd0d2f36513b002e54366beeede8' 
  AND token = 'wS57jj5WaCtRlwlG617yz4yvjIsYY81xmVMhOUrxx9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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