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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e75b81fee21e97cd9d3d4b40232d92abddd35f9be29886f60e69e4e046fe882' 
  AND token = 'RLfI0mcEijB59tIT0444kXFqfsNWStB5Sl/VXtD0c8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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