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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ee4f439de1f142a6fce323b23dbe9456474a0eb0a342b8327e00ad6abebf02' 
  AND token = '9DTqI5e6yfApYX4jZpBWCas0xtSnytBHDu00ugVUzvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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