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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cd19fdef4e5743b95d8500e14cfd10c9f75e5a37a365f8a71ca3dc58ce5a8ab' 
  AND token = 'sMiB2GOnFy06BBS+Sxq7F8SXXDlEt41AKAHy7kDpsMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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