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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f3bf1f7b8d8c59cbb013120a07df90513bb016243e4e65207bc4f9a85ea9e4c' 
  AND token = 'a7n2Hhi02hUjKQrzegjRqHQkUxKaEqONkx15AWyM9x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00099

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