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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '863e938d1ebef172e63a16327c2b893c524eabd51ff6416d7d760179d89fc048' 
  AND token = 'pucSL05ZFfUSXFbo5fst0kxZRdvPwBO7rg6MU7qbxDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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