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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad8f365ab483665d22ec69468536ef4d951ae9ba5f13b05f97a8734d892bdbb8' 
  AND token = '211YEXPkjBIcIs2sgd47Gi7WR56Q4zIJFBJXWMg6VlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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