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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0b95e02b3a61706533291db17d68dabd4345427acbfb8eba559af7cdea0db16' 
  AND token = 'IAV6v2lwT/mwv7ga5fUCeWUj0wupPk8vyimh1eXJpcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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