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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e8da773c84782c998fde644614d8cd9c7c9750199e3cc58b95dc11eb8480ae2' 
  AND token = 'bbJ+wFrzsABVtH/1h3jSdsrNLuCfuYTJ3v4BDl4PAkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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