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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a83944f8d29488c727cc14f45fee75b40a5691a1379f783c7550a16f7fc6858' 
  AND token = 'mCufmqp6Bv45Dq0T4KTiOOQ/32JYQOV0BsWyRPrsKpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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