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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24d512ca93bb9fb22130f11d6b41084075417ee4e1fd0f8e11ecdafdcfac6c29' 
  AND token = 'yXIzv7T4/gtMHZ4X0pOUysLFheh+hGgEkEPrePv9n3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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