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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e94c846fb529183848af8e7780c739e4730d724bf0dd50a408b6369beaaa408c' 
  AND token = 'tpaw5rDKkD03tJKijzHK+7nhYp+CTCqVdlycaaQGKhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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