SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0838f0d290542a99b7fa7ba98f8af907006607d586125dfce767cc0231b7534d' 
  AND token = 'KWiWXcpNMU/6tIvMnu4nJgo5NG96NWRxSVQBhsy6j+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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