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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b262c6e6539476ddfee7f65c5799f4758164ed3b9fed26b608c015a3472cdc3e' 
  AND token = 'exuJ77h2zIJBisfEbiIGnDqy6lRtyEDn06J0gGYLLHA=' 
  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