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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '267be92e0332e458dd393dc47136f301b316e9294e8f9dc536d5450be47c5121' 
  AND token = 'mzGEUcMec26AiOkfOstxasExX5ixq7QiIF6r6CevJrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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