SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26784b227be52483e6e2352a930598fdf250bad226f4f9398074b68634a5a71d' 
  AND token = '/A67VJat6+qO+BZRLUdpn1EZH4dKFhRqg/wr7q+0sPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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