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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e4f5ad4c6a8f075c78c16613508271b1c1b0eb5f564c8b9c07226129c25646a' 
  AND token = '56qkGFJ1PYEsMRYqKvzVEn0fU8wOETU3xYApXJogciQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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