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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a8dbc2ccae3bc97c10517fe1d9eb7b73b9b95ea909a472affaf2a2256218a71' 
  AND token = 'FCcIXgKB1z8VMCOMclJYYDi6qVKbaQiMKFHYMKCUJDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

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