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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80e7e212a4fa19ae3b1a4128c9466d47359f2fc7e2a61c293fdaa42b17c9239a' 
  AND token = 'fCSA5zq8EbtMdN41Q0VMc5XbFwj9i3CVlKYDzH9QWOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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