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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9be8c4f6fc0a4d6463b45e799a5f9aaf4a6da929735edc5447de25826dbff6e' 
  AND token = 'zqn+KoBHSwffMMozo6jZ65tF/meVVyKaNCcQ8rZJnig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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