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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf732b68b4e99d8b0184cfa7524c21e022a08ff26c0fcf82e530d9c87e879ec' 
  AND token = 'nYuY0hfh4v4fpptKMbEbhy6JffWv4bNfkcbtroyFBhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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