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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdbd39f791f635f10450030fbfce4f6c4687b024fa9db5fdf34650c35e42e777' 
  AND token = 'pgv1V4tun7ZvBi7X094tSJtaAXrkXZiNrlnBr1igHqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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