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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d0e5d40cf522d937d66716b76697001d6dea21fa25b87bcf5c004b9feaed84' 
  AND token = 'ET8ejI6nbhZDuzNFFd9FdyP7oFC3RyqrdcZM8wjUpdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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