SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aabad0ff924f0edd43674de24411478759421e4abe886e905ffb7cd3f87b4f98' 
  AND token = 'B/ukz4JJKkZqkVB+zBhX6pmlbIpkY5wO01Hmlu6ab7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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