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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2394525c232db17a03121d19ce68147b9322e7cae107c1b5d2a492a3f05d77af' 
  AND token = 'x/BKJqiF1Db1AWPaJdwd7PH9YFDemHgshy9l8BAer/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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