SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e215bb03ab46e99e246ab87803c7d6f647530016dabf4f72290a87565ae0ece' 
  AND token = '43A9iWzJ1oRXlo8VJsR6HTQK8ywuZ/GgY1WtNUAv1WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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