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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0c20b10e76cc20565765e57fa74481ec8d9fbc8d9db4ecbaa9c297a52fa9b93' 
  AND token = '+jj6KkYLzVfrHQ5Zfu8s5OAjIPrOKtfrS103xix9EJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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