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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fadb12de9116553c1acf21cf6ef0393beca9f88590cfd57c3efc5d99b2601773' 
  AND token = 'kRUqVXZGVtht26Q3YQCJtqgOY59bwK0d48EVDV9ZBrM=' 
  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