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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd0b0f356c89c8c0fa6ea07a6a671dd8cb7cc1252a717ad6794447ccf3eabc0' 
  AND token = '12bm3QwN9b1S9gnsYj4zOjuWXlUPuGUqUc1EdUf9tek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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