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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05b39a002d0963d15234ab88c7aaa910c555e33de6fa0d2000cb4cb715455cff' 
  AND token = 'U71MG6veO/1MvQME/YMZgG2bUKftnHo4U2TmISFnl3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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