SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '584fd85c81e77e985a1c7081d04a7350b9e39bb9a643ca5e6a7996aceb2bad3f' 
  AND token = 'yu2kJ3PiJ1z8r6Lr2uqKqN+jZfxUe/mH+JnK6hYhS6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}