SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db62055643737c331d9c4304ede38880134b27821fb7e8361162487c12afdf1d' 
  AND token = 'jYyBsfMtw9azK6EjVjFqV3zQ8BPIQLZQ0YvlaCICxJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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