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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '230e07e7dffe0dcef81aaa3e5dd18f097f8c2cedec9b192da3f1f8c160f5b23b' 
  AND token = '6VqB3jj2lMpT0dAQzh2jQWokspBIkE1c/OedPStxmsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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